Performance of new 8-inch photomultiplier tube used for the Tibet muon-detector array
arXiv:1603.00008 · doi:10.1088/1748-0221/11/06/P06016
Abstract
A new hybrid experiment has been constructed to measure the chemical composition of cosmic rays around the "knee" in the wide energy range by the Tibet AS collaboration at Tibet, China, since 2014. They consist of a high-energy air-shower-core array (YAC-II), a high-density air-shower array (Tibet-III) and a large underground water-Cherenkov muon-detector array (MD). In order to obtain the primary proton, helium and iron spectra and their "knee" positions in the energy range lower than eV, each of PMTs equipped to the MD cell is required to measure the number of photons capable of covering a wide dynamic range of 100 - photoelectrons (PEs) according to Monte Carlo simulations. In this paper, we firstly compare the characteristic features between R5912-PMT made by Japan Hamamatsu and CR365-PMT made by Beijing Hamamatsu. This is the first comparison between R5912-PMT and CR365-PMT. If there exists no serious difference, we will then add two 8-inch-in-diameter PMTs to meet our requirements in each MD cell, which are responsible for the range of 100 - 10000 PEs and 2000 - 1000000 PEs, respectively. That is, MD cell is expected to be able to measure the number of muons over 6 orders of magnitude.
5 pages, 8 figures
References in corpus (7)
- On the knee in the energy spectrum of cosmic rays
- The all-particle spectrum of primary cosmic rays in the wide energy range from 10^14 eV to 10^17 eV observed with the Tibet-III air-shower array
- Models of the Knee in the Energy Spectrum of Cosmic Rays
- Are protons still dominant at the knee of the cosmic-ray energy spectrum?
- PeV Cosmic Rays: A Window on the Leptonic Era?
- Sensitivity of YAC to measure the light-component spectrum of primary cosmic rays at the "knee" energies
- Development of Yangbajing Air shower Core detector array for a new EAS hybrid Experiment